Hello Mark, welcome to the Ranch!
It's worth pointing out that we're all volunteers here and any urgency you have is not shared. In fact, demands such as "Urgent help" will often put people off helping you out at all. It's just not fun.
Now, back to your question. What have you tried so far? Have you read the
jforum installation instructions on
jforum.net? I'd say that would be a good place to start. What specific thing are you having trouble with just now?